Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afd3432ac6b6ced…

MALICIOUS

PDF

50.1 KB Created: 2020-11-08 10:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 1370b42af544974907d5d1b194d26a87 SHA-1: 4a5f5d7286d4e2808863b3190a763be16fdb8563 SHA-256: 7afd3432ac6b6ced7043d965ad60510ddc2f70325871022852529bcfcef044e9
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/aws?keyword=hard+answers+skyrim PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5f973c576de67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f9114071c53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5fa4c06d754be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f95cec89247d.pdfIn PDF document text
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/6b7dd.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/9362777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a25800a-907e-425d-88fa-4c2acf022c0d/separados_capitulo_124_de_esperana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b629cf-f7a4-4ea6-be70-65d292ebda6a/17914859853.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/defensa_nacional_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/fefawenosijunavixobozum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66bac621-07cb-43ea-97b8-472373f7dd55/73298828149.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 4756 bytes
SHA-256: ac491e54af98aac1484281ff1d46ae3d0653483ced917cb2e91209d6c42e3793
font_01_sfnt_off0000885e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x885E 11204 bytes
SHA-256: 87a664470a7f4c0567a0177270a0655d7ad88d199754bfc60a72ec83c87c5d0e
font_02_sfnt_off0000ad53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD53 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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